For general interest and discussion:
Paper 7 at the link below compares the groundwave field intensity vs. distance for several transmitter power levels radiated by a 1/2-wave monopole on frequencies from 600 kHz to 1600 kHz, over paths of three different conductivities.
http://rfry.org/Software & Misc Papers.htm
Paper 7 at the link below compares the groundwave field intensity vs. distance for several transmitter power levels radiated by a 1/2-wave monopole on frequencies from 600 kHz to 1600 kHz, over paths of three different conductivities.
http://rfry.org/Software & Misc Papers.htm